Input validation vulnerability in Append Link on Copy 0.2

The plugin called “Append Link on Copy” for WordPress has a security issue in versions 0.2 and below. This is because it doesn’t properly clean up or protect against harmful code being inserted into pages. This could allow someone with high-level access to the website to add their own code, which could then be executed whenever someone visits that page. This only affects websites that have multiple sites or have disabled the feature that filters out harmful code.